Hi RH,
Sorry to hear about your issue. I' ve not seen this one personally, I' ve been a heavy user of FMGR for a few years now.
I would first recommend that you update FortiManager to the latest version and recheck this function. If that doesn' t work for you, please backup the configuration and open a TAC case so we can get this working for you.
The only time I' ve seen something like what you' re describing is if one policy push doesn' t work for a couple of FGTs and they come back in error status, then next time you push, the ones that already received the change would say " no changes needed" whereas the ones that had errored before would have the changes.
Out of interest, when this happened did you verify manually that the config change wasn' t there locally on one of the FGT' s that said No changes needed?
Hope this helps
Cheers!
--
Sean Toomey, CISSP FCNSP
Consulting Security Engineer (CSE)
FORTINET— High Performance Network Security